<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <title>双飞翼布局</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .header{
            height: 50px;
            background: red;
        }
        body{
            min-width: 600px;
        }
        .content{
            /* padding: 0 200px; */
            overflow: hidden;
        }
        .content .middle{
            float: left;
            width: 100%;
            background: yellow;
            /* box-sizing: border-box;*/
            /* padding: 0 200px;  */
        }
        .content .middle .mid_inner{
            padding: 0 200px;
        }
        .content .middle,.content .left,.content .right{
            padding-bottom: 10000px;
            margin-bottom: -10000px;
        }
        .content .left{
            /* position: relative;
            left: -200px; */
            width: 200px;
            float: left;
            background: pink;
            margin-left: -100%;
        }
        .content .right{
            /* position: relative;
            right: -200px; */
            width: 200px;
            float: left;
            margin-left: -200px;
            background: green;
        }
        .footer{
            height: 50px;
            background: blue;
        }
        .clearfix{
            *zoom: 1;
        }
        .clearfix::after{
            content: "";
            display: block;
            clear: both;
        }
    
    
    </style>
</head>
<body>
    <div class="header">header</div>
    <div class="content clearfix">
        <div class="middle">
            <div class="mid_inner"><h1>cccc</h1>
            <h1>cccc</h1>
            <h1>cccc</h1>
            <h1>cccc</h1>
            <h1>cccc</h1>
            <h1>cccc</h1>
            <h1>cccc</h1>
            <h1>cccc</h1>
            <h1>cccc</h1>
            <h1>cccc</h1></div>
        </div>
        <div class="left">left</div>
        <div class="right">right</div>
    </div>
    <div class="footer">footer</div>
</body>
</html>